254B.5.5.2.2 Time Service response (protected). 253B.5.5.2 Active time acquisition (protected). 253TABLE OF CONTENTS(continued)PARAGRAPH PAGEB.5.4.4 Protected 3G PI progression. 253B.5.4.3.2 Protected 3G asynchronous-mode response. 253B.5.4.3.1 Protected 3G asynchronous-mode scanning call. 253B.5.4.3 Procedure for asynchronous-mode 3G ALE. 252B.5.4.2 Procedure for synchronous-mode 3G ALE. 252B.5.4.1 Encryption of 3G protocol data units (PDU). 252B.5.4 Procedure for 3G ALE - not tested (NT). 252B.5.3.4 Data block message (DBM) mode. 245B.5 DETAILED REQUIREMENTS 246B.5.1 Linking protection. 244B.4.5 Time of day (TOD) synchronization. 244B.4.1.1.5 Classified application level AL-4. 241B.4.1.1 Linking protection application levels. 240B.3.1 Standard abbreviations and acronyms. 239B.2.2.2 Other Government documents, drawings, and publications.
239B.2.2.1 Specifications, standards, and handbooks. There's a lot going on inside that unit.B.1 GENERAL. Is there anything that can decrypt actual encrypted signals?ĭigital trunking scanners are friggin expensive. As long as the system in question is not using an encryption routine on top of the digital encoding, its not difficult at all to monitor such system There's plenty of scanners now that can decode in real time a digitally trunked system. Most state and local agencies are not encrypted but some of the federal agencies are.
Most do not encrypt because of cost and/or interoperability between agencies. They only encrypted frequencies I have found were tac channels. Police will tell you their system is encrypted because they think it is. I have a RadioShack 106 that will decode APCO-25. As long as the system in question is not using an encryption routine on top of the digital encoding, its not difficult at all to monitor such systems. I don't think there is a scanner built that can deal with all the variables fast enough to decode the signal back to intelligible audio -its essentially an EDACS system on steroids (Google opensky) So essentially they are encrypted but its more like trying to listen to a nextel radio or digital phone signal on an analog scanner. They are trunked but they are digital -and around here only the state police and either Motorola or Harris whomever built the system know the encoding algorithm.
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